What do you think is the best bullet for whitetail between 350 and 500 yards. My rifle will shoot the 140 grain ballistic tip
at around 3080 with extreme acurracy (3 inch groups at 500 yards). Is this a good bullet for deer at the longer ranges or should I move up to a 150 or 160 but sacrifice the velocity.

PT,
I don't think you can get much better than the Ballist Tip for long range shots.

I user the 140 with 57gr IMR4831 in my .280. Very accurate. The heavier bullets do have a higher BC, but I like the extra velocity. The additional drop at 500yds is only 3 inches or so with the 140s in my real word testing.

BTW, I shot a small buck last fall at 21 paces (out of my bow stand). I hit the spine just behind the shoulder. Needless to say, he went straight down. It took out 3 vertebrae and lodged under the skin.
It weighed 138gr.

Use that 140 BT and never look back....

My rifle shoots it at around 3000 fps...I've taken a deer and a bull caribou between 350 and 500 and a few other animals over 300...

Works great......

I would suggest experimenting with Hornady's Light Magnum loads. It's a 139 grain moly-coated soft point traveling around 3100 fps and it was particularly devastating on springbok in South Africa this year. I was fortunate to get quite a bit of shooting in and probably harvested nearly 30 animals with it. I had great results to 300 yards and beyond.

Might be a good one to try.

Don Martin.